Question

what are (a) normal elememts, (b) harmful elements? give two examples of each.

Answer 1

Answer:

normal elememts => The elements that do not give out any harmful radiations are called Normal Elements.

Example: Fluorine (F), Chlorine (Cl), Bromine (Br), etc.

harmful elements => the elements that give out harmful radiations are called Radioactive Elements.

Example: Uranium (U), Thorium (Th),